Mount Prospect, Illinois 7 Day Weather Forecast

Wx Forecast - Wx Discussion - Wx Aviation

480
FXUS63 KLOT 022324
AFDLOT

Area Forecast Discussion
National Weather Service Chicago/Romeoville, IL
624 PM CDT Tue Jun 2 2026

.KEY MESSAGES...

- Generally warm conditions are expected through early next week
  but cooler near the lake Wednesday and again this weekend.

- Periodic shower and thunderstorm chances return Friday into
  early next week.

&&

.DISCUSSION...
Issued at 259 PM CDT Tue Jun 2 2026

The quiescent weather pattern continues as an expansive 1030mb
surface high remains centered over the Great Lakes. Northeast
to east flow on the southern side of the high has helped keep
temperatures cooler yet again today, with afternoon highs in
the 60s along the lakeshore and 70s across the rest of
northeast Illinois and far northwest Indiana. Areas west of I-39
and toward central Illinois still managed to reach the lower to
mid 80s.

As the center of the surface high begins to gradually drift to
the southeast into Wednesday the surface flow begins to trend
more south to southeasterly here locally. The loss of broader
lake influence will allow 80 degree temperatures to expand back
into the majority of the area, the exception to this being along
the lakeshore and a bit farther inland across far northeast
Illinois. Temperatures may still manage to approach the lower
70s initially near the lakeshore toward midday given lighter
flow in the morning before cooling back into the 60s in the wake
of a reinforcing lake breeze in the afternoon. Breezy
southwesterly warm air and moisture advection then sets up into
Thursday through the end of the week allowing areas along the
lakeshore to experience the warmer temperatures which are
forecast into the low to mid 80s!

Ensemble guidance continues to point toward a more unsettled
pattern returning toward the end of the week as the amplified
upper ridge begins to break down. A series of shortwaves and
associated surface fronts then likely traverse the broader
region at times through early next week. The first of which is
expected to arrive late Friday and could bring a period of
scattered showers and storms. While the signal for severe
weather is pretty low given overall weaker shear, anomalously
high PWATs will be favorable for localized heavy downpours.
Additional shower and storm chances exist Saturday and again
early next week though there will still be plenty of dry hours.

The temperature forecast remains lower confidence this weekend
into early next week and will ultimately be dependent upon
shower and thunderstorm coverage along with the timing of any
potential backdoor fronts. The general trend is toward onshore
flow returning along with cooler conditions being favored near
Lake Michigan Sunday into early next week.

Petr

&&

.AVIATION /00Z TAFS THROUGH 06Z THURSDAY/...
Issued at 624 PM CDT Tue Jun 2 2026

No significant aviation forecast concerns with the 00Z TAF
cycle.

Surface high pressure was centered over the western Great Lakes
early this evening, maintaining modest northeast to east winds
and fine VFR weather conditions across the terminals. Winds will
gradually weaken after sunset, and are expected to become light
and variable (less than 5 kts) overnight due to the proximity of
the high pressure center. The high will begin to drift slowly
off to the east of the area Wednesday, with winds becoming light
south-southeasterly after sunrise. An east-southeasterly lake
breeze (east-northeasterly at GYY) is expected to develop during
the afternoon with a minor shift in wind direction to perhaps
at 100-110 degrees at ORD/MDW. Winds Wednesday evening should
become light south-southeast again. Otherwise, VFR conditions to
persist with just a bit of an increase in high-level (~30 kft)
cirrus.

Ratzer

&&

.LOT WATCHES/WARNINGS/ADVISORIES...
IL...None.
IN...None.
LM...None.

&&

$$

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